A/2019 G2
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Perihelion	6 Dec 2019	20.7	2.308 AU	1.922 AU	10h59m	+33°35'	100.0°	24.9°	290°
Nearest approach	9 Jan 2020	19.8	2.340 AU	1.463 AU	08h19m	+54°53'	145.5°	13.8°	204°
Today	15 Sep 2025	28.3	16.024 AU	15.045 AU	23h50m	-15°52'	166.4°	0.8°	340°

The interactive orbit chart above shows the comet's path through the solar system and its position at the given date. Green and blue lines are shown perpendicular to the ecliptic plane: Green if the path is above the ecliptic plane, blue if it is below. (Left-click and drag to rotate the view; Right-click and drag to move the view; Use scroll wheel to zoom in our out.)

The orbital elements of A/2019 G2 are:

            e (Eccentricity)                : 0.9942640
            q (Perihelion distance)         : 2.3075540
            i (Inclination)                 : 159.25940
            Ω (Longitude of ascending node) : 208.25060
            ω (Argument of perihelion)      : 82.81440
            L (Longitude of perihelion)     : 125.92839
            B (Latitude of perihelion)      : 20.57029
            T (Time of perihelion passage)  : 2458823.79320
            P (Orbital period in years)     : 8068.90

            Epoch                           : 2025 Sep 14
            Reference                       : MPEC 2024-E01

            Classification(s):              : Nearly isotropic; Returning (a < 10000 AU); External (P > 200 years)
        

The light curve chart below shows the estimated development of the comet's magnitude. Blue and black dots are visual and photometric CCD observations respectively from COBS or the MPC. The gray curve indicates the expected brightness if this object is a comet (15.00 + 5 log[∆] + 10.00 log[r]), whereas the red curve indicates the expected lightcurve for an asteroid (H=16.30; G=.15).

The all-sky chart below shows the path of the comet over the same period as the light curve. The comet's current position is marked yellow.

The following chart shows the short-term path of the comet in a field of view that is optimized for (~10x50) binoculars and finderscopes.
A more printer-friendly version of the same chart can be found further down this page as well.

The following chart shows the current location of the comet in a smaller, upside-down telescopic field of view.

A printable version of the short-term path of the comet in a field of view that is optimized for (~10x50) binoculars and finderscopes.

Ephemerides:

Date       Time       RA (2000)    DEC (2000)    delta   radius  elong  phase   PA    magn
2025-09-15 00:00 UT   23 50 44.5   -15 51 59    15.043   16.022  166.4    0.8   338   28.3 
2025-09-15 08:04 UT   23 50 38.9   -15 52 38    15.045   16.024  166.4    0.8   340   28.3 
2025-09-16 00:00 UT   23 50 27.9   -15 53 53    15.049   16.028  166.3    0.9   343   28.4 
2025-09-17 00:00 UT   23 50 11.4   -15 55 45    15.055   16.033  166.1    0.9   347   28.4 
2025-09-18 00:00 UT   23 49 54.8   -15 57 37    15.062   16.039  165.9    0.9   351   28.4 
2025-09-19 00:00 UT   23 49 38.2   -15 59 27    15.069   16.044  165.6    0.9   356   28.4 
2025-09-20 00:00 UT   23 49 21.6   -16 01 16    15.076   16.050  165.2    0.9   359   28.4 
2025-09-21 00:00 UT   23 49 05.0   -16 03 04    15.084   16.056  164.8    0.9     3   28.4 
2025-09-22 00:00 UT   23 48 48.5   -16 04 51    15.092   16.061  164.3    1.0     7   28.4 
2025-09-23 00:00 UT   23 48 31.9   -16 06 36    15.100   16.067  163.7    1.0    10   28.4 
2025-09-24 00:00 UT   23 48 15.4   -16 08 20    15.109   16.072  163.1    1.0    13   28.4 
2025-09-25 00:00 UT   23 47 59.0   -16 10 02    15.118   16.078  162.5    1.1    16   28.4 

    Terminology:
            
    delta:  distance between comet and earth in AU
    radius: distance between comet and sun in AU
    magn:   magnitude (brightness) estimate    
    ra:     right ascension in hours (24h = 360deg)
    dec:    declination in degrees
    elong:  elongation in degrees (angle sun-earth-comet)    
    phase:  phase angle in degrees (angle sun-comet-earth)        
    AU:     Astronomical Unit (mean distance between earth and sun: 149597870.7 km      
    

Orbital elements usually provided by the MPC (Minor Planet Center).
Observations contributed by observers worldwide, via COBS (Comet Observation Database) or the MPC (Minor Planet Center)
Calculations by a modified version of AAPlus, a C# implementation of the AA+ project by PJ Naughter from the algorithms presented in the book "Astronomical Algorithms" by Jean Meeus.
NGC2000 dso catalog and star labels from VizieR as provided by the Strasbourg astronomical Data Center.
Tycho2 catalog from the ESO archive.